Rainbow CMS available today in 29 languages, allows content authoring to be safely delegated to role-based team members who need little or no knowledge of HTML. Rainbow optionally supports a two-step approval-publish process. 75 plug-in modules are now included in the standard release, including support for an e-store, XML news feeds, Flash, Maps, Newsletter, Surveys, Forums, Document Management, Custom Lists, and more. It's also fairly easy to build your own custom modules. 

 Rainbow CMS could host multiple sites and could use single database. The sites are made from pages, Pages are arranged hierarchical to unlimited depth. Menus are used to navigate across pages. Each page is made from modules. Any content whether it is text, images, news item will be generated out of modules. Developer could easily extend and achieve their needs. 
 
 Its feature set includes flexible Users and Roles management, Full text Search, WYSIWYG editor, RSS and lot more. It has in built modules like breadcrumb support, Blog, Event log, Discussion forum, FAQ, Newsletter, Gallery, Survey etc. 
 
 It is a full fledged CMS with lot of features in-built. Source code location: <A HREF="http://code.google.com/p/rainbow/" target="_blank">http://code.google.com/p/rainbow/</A>

Rainbow CMS available today in 29 languages, allows content authoring to be safely delegated to role-based team members who need little or no knowledge of HTML. Rainbow optionally supports a two-step approval-publish process. 75 plug-in modules are now included in the standard release. It is also fairly easy to build your own custom modules.

Rainbow - portal development made easy

TWiki is a flexible, powerful, and easy to use enterprise wiki, enterprise collaboration platform, and web application platform. It is a Structured Wiki, typically used to run a project development space, a document management system, a knowledge base, or any other groupware tool, on an intranet, extranet or the Internet. Users without programming skills can create web applications. Developers can extend the functionality of TWiki with Plugins. TWiki fosters information flow within an organization, lets distributed teams work together seamlessly and productively, and eliminates the one-webmaster syndrome of outdated intranet content. TWiki has been downloaded over 500,000 times and is used daily by millions of people in over 100 countries. Some larger deployments have several 100,000 pages and over 10,000 users. TWiki is a cgi-bin script written in Perl. It reads a text file, hyperlinks it and converts it to HTML on the fly. Its main features include
 <UL>
	<LI>Edit existing pages or create new pages by using any web browser</LI>
	<LI>To edit a page, simply click on the Edit link at the bottom of every page. </LI>
	<LI>Web pages are linked automatically. You do not need to learn HTML commands to link pages. </LI>
	<LI>Simple, powerful and easy to learn text formatting rules</LI>
	<LI>Pages are grouped into TWiki webs (or collections). This allows you to set up separate collaboration groups.</LI>
	<LI>Full text search with/without regular expressions</LI>
	<LI>E-mail notification</LI>
	<LI>Structured content: classify and categorize unstructured web pages</LI>
	<LI>File attachments</LI>
	<LI>Revision control</LI>
	<LI>Access control</LI>
	<LI>Plugin support</LI>
	<LI>Templates and skins</LI>
	<LI>Managing pages</LI>
	<LI>Managing users</LI>
	<LI>Generate statistics</LI>
 </UL>

TWiki is a flexible, powerful, and easy to use enterprise wiki, enterprise collaboration platform, and web application platform. It is a Structured Wiki, typically used to run a project development space, a document management system, a knowledge base, or any other groupware tool, on an intranet, extranet or the Internet. TWiki is a cgi-bin script written in Perl. It reads a text file, hyperlinks it and converts it to HTML on the fly.

TWiki - Wiki and Web 2.0 Application Platform

MediaWiki is powers Wikipedia.org. MediaWiki is designed to be run on a large server farm for a website that gets millions of hits per day. MediaWiki is an extremely powerful, scalable software and a feature-rich wiki implementation. Pages use MediaWiki's wikitext format, so that users without knowledge of XHTML or CSS can edit them easily. When a user submits an edit to a page, MediaWiki writes it to the database, but without deleting the previous versions of the page, thus allowing easy reverts in case of vandalism or spamming. MediaWiki can manage image and multimedia files, too, which are stored in the filesystem. For large wikis with lots of users, MediaWiki supports caching and can be easily coupled with Squid proxy server software.

MediaWiki is powers Wikipedia.org. MediaWiki is designed to be run on a large server farm for a website that gets millions of hits per day. MediaWiki is an extremely powerful, scalable software and a feature-rich wiki implementation. Pages use MediaWiki's wikitext format, so that users without knowledge of XHTML or CSS can edit them easily.

MediaWiki - powers Wikipedia

Reddit is a web-based social bookmarking system. It allows multiple users to store, share and tag their favorite links online. Users will provide the content (links) and decide through voting what's good and what's junk. Links that receive community approval bubble up towards #1, so the front page is constantly in motion and filled with fresh and interesting links. Sub groups (community) could be created and each groups could be moderated by its owners. 
 The content are indexed and available for search. <A HREF="www.reddit.com" target="_blank">Reddit</A> has millions of page views per day and it has highly scalable architecture, written in Python. It has API support, Private messaging, User profile management, Comments etc.

Reddit is a web-based social bookmarking system. It allows multiple users to store, share and tag their favorite links online. Users will provide the content (links) and decide through voting what's good and what's junk. Links that receive community approval bubble up towards #1, so the front page is constantly in motion and filled with fresh and interesting links. Sub groups (community) could be created and each groups could be moderated by its owners.

Reddit - Social bookmark engine 

Jahia is a open source Enterprise Content Management System. It supports Content Management, Document Management, Wiki, Blog, Forum, Social networking, Workflow, Document search, Federated Search, Multilingual, Multi Site Management, Mobile Apps etc.

Jahia - Enterprise Content Management in Java

ocPortal CMS have all the features you would expect from a website engine: for instance photo galleries, news, file downloads and community forums/chats, but it does so whilst meeting the highest accessibility and professional standards. It is also smart enough to go beyond page management, to automatically handle search engine optimisation, and provide aggressive hack attack prevention. Demo Site: <A HREF="http://ocportal.com/site/demo.htm" target="_blank">http://ocportal.com/site/demo.htm</A> Its features include:
 <UL>
	<LI>Quick installer with Wizard-based installation</LI>
	<LI>Banner support, accepts Image, Flash, Text</LI>
	<LI>Search engine support with Full text search</LI>
	<LI>Newsletters and mass-mailing</LI>
	<LI>Support ticket system</LI>
	<LI>eCommerce and subscriptions</LI>
	<LI>Support for Multiple payment gateways</LI>
	<LI>Showcase popular content</LI>
	<LI>Image of the day</LI>
	<LI>News and blogging</LI>
	<LI>Event Calendar</LI>
	<LI>Structured wikis</LI>
	<LI>Built in Survey </LI>
	<LI>WYSIWYG editor</LI>
	<LI>Polls</LI>
	<LI>Points system for members</LI>
	<LI>Chatrooms and instant messaging </LI>
	<LI>User and Group access control</LI>
	<LI>Administration: Backup, Analytics, Audit trails etc </LI>
	<LI>Theme support</LI>
	<LI>Search engine optimisation</LI>
	<LI>CAPTCHA, to stop spammers</LI>
	<LI>Localisation support </LI>
	<LI>Forum support. Integrate popular forums</LI>
 </UL>

ocPortal CMS have all the features you would expect from a website engine: for instance photo galleries, news, file downloads and community forums/chats, but it does so whilst meeting the highest accessibility and professional standards. It is also smart enough to go beyond page management, to automatically handle search engine optimisation, and provide aggressive hack attack prevention.

ocPortal - Advanced CMS with many features

Umbraco provides a full-featured web content management system that is easy to use, simple to customize, and robust enough to run the largest sites such as <A HREF="http://wired.co.uk" target="_blank">wired.co.uk</A> and <A HREF="http://asp.net" target="_blank">asp.net</A>. It is most popular and widely used CMS. It has more than 85000 active installations. 

 It has loads of features required for a CMS. It does provides support for Polls, Forum, Podcast blog, Event management, Access control and permissions for pages, WYSIWYG editor, Displays twitter feed and post, Searchengine friendly, Gallery, Paypal support, Personalization of content for logged-in User and lot more. 
 
 This open source product can be bundled with guaranteed and professional support, bug fixing warranty and productivity enhancing add-ons. 

 Source code location: <A HREF="http://umbraco.codeplex.com/" target="_blank">http://umbraco.codeplex.com/</A>

Umbraco provides a full-featured web content management system that is easy to use, simple to customize, and robust enough to run the largest sites. It is most popular and widely used CMS. It has more than 85000 active installations.

Umbraco - simple and friendly ASP.NET CMS

KiGG is a Web 2.0 style social news web application developed in Microsoft supported technologies. It allows multiple users to store, share and tag their favorite links online. The links could be tagged and Users will allowed to vote up or down the links. It rates the User based on their links posted and votes received. SQL Server or MySQL could be used as database back end. It powers websites <A HREF="http://www.DotNetShoutout.com" target="_blank">DotNetShoutout.com</A> - A site where you find links for .NET stories.

KiGG is a Web 2.0 style social news web application developed in Microsoft supported technologies. It allows multiple users to store, share and tag their favorite links online. The links could be tagged and Users will allowed to vote up or down the links. It rates the User based on their links posted and votes received. SQL Server or MySQL could be used as database back end. It powers websites DotNetShoutout.com - A site where you find links for .NET stories.

kigg - Social bookmarking engine in ASP.NET

InfoGlue is one of the most advanced, scalable and robust Open Source content management / portal platforms available. InfoGlues increased focus on usability together with flexibility in every area makes it suitable for a wide range of applications and organizations. 
 
 Key features includes JSR-168 support (portlets), full multi-language support, unlimited number of sites in one installation, excellent information reuse, high performance and extensive integration capabilities. It has cross platform support and works with multiple databases. Check out its <A HREF="http://www.infoglue.org/Projects/InfoGlue/Features/" target="_blank">complete feature set</A>. 

 Infoglue family has two additional projects, Calendar and Eclipse IDE integration.

InfoGlue is one of the most advanced, scalable and robust Open Source content management / portal platforms available. InfoGlues increased focus on usability together with flexibility in every area makes it suitable for a wide range of applications and organizations.

Infoglue - CMS and Portal Platform

PmWiki is a wiki-based system for collaborative creation and maintenance of websites. It stores data in the file system and it doesn't require database. It has all required features for a wiki such as Page editing, Page history, Web feed, Email notification for revised page, Navigation trails, Search support, Spam protection and lot more.

PmWiki - PHP based Wiki

Yii is a high-performance purely object-oriented PHP framework best for developing Web 2.0 applications. Yii comes with rich features like MVC, DAO/ActiveRecord, Form input and validation, AJAX-enabled widgets, I18N/L10N, Caching, Authentication and Role-based access control, Scaffolding, Testing, Web services, Data caching, Page caching,  etc.

Yii Framework - Fast, Secure and Professional PHP Framework

StatusNet is a microblogging platform. It helps people in a community, company, or group to exchange short (140 character) messages over the Web. Users can choose which people to “follow” and receive only their friends' or colleagues' status messages. It provides a similar service to sites like Twitter or Yammer.

Statusnet - Microblogging platform powers Identi.ca

Pinry is a a tiling image board system for people who want to save, tag, and share images, videos and webpages. 

Pinry - A tiling image board system, Alternative to Pinterest

A powerful open source social networking platform. It provides the components you need to build a fully-featured social environment, including 
 <UL>
	<LI>Profiles</LI>
	<LI>Social bookmarking</LI>
	<LI>Groups</LI>
	<LI>Activity Streams</LI>
	<LI>Access controls</LI>
	<LI>Blogging / Microblogging</LI>
	<LI>Web Services API</LI>
	<LI>Pages</LI>
	<LI>RSS / JSON</LI>
	<LI>Widgets</LI>
	<LI>Video</LI>
	<LI>Documents</LI>
	<LI>Photo Gallery</LI>
 </UL>

A powerful open source social networking platform. It provides the components you need to build a fully-featured social environment, including Profiles, Groups, Activity Streams, Access controls, Blogging / Microblogging, Web Services API etc.

Elgg

DokuWiki is a standards compliant, simple to use Wiki, mainly aimed at creating documentation of any kind. It is targeted at developer teams, workgroups and small companies. It has a simple but powerful syntax which makes sure the datafiles remain readable outside the Wiki and eases the creation of structured texts. All data is stored in plain text files – no database is required. Its features include:
 <UL>
	<LI>Simple syntax </LI>
	<LI>Unlimited page revisions</LI>
	<LI>Recent changes and Colored side by side diff support </LI>
	<LI>Uploading and embedding of images and other media </LI>
	<LI>Customizable Interwiki links</LI>
	<LI>Section Editing allows editing of small parts of a page</LI>
	<LI>Easy navigation through breadcrumbs</LI>
	<LI>Automatic table of contents generation</LI>
	<LI>Access Control and Anti-Spam support</LI>
	<LI>Internationalization support</LI>
	<LI>Index-based fast fulltext search</LI>
	<LI>Pagecaching for quicker rendering</LI>
	<LI>Layout customizable through templates</LI>
	<LI>Plugin support</LI>
	<LI>RSS support</LI>
 </UL>

DokuWiki is a standards compliant, simple to use Wiki, mainly aimed at creating documentation of any kind. It is targeted at developer teams, workgroups and small companies. It has a simple but powerful syntax which makes sure the datafiles remain readable outside the Wiki and eases the creation of structured texts. All data is stored in plain text files – no database is required.

Dokuwiki - simple to use Wiki

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